Impulse repeating arrangement



Sept. 16, 1941. w. ROTSCHEIDT IMPULSE REPEATING ARRANGEMENT 'Filed May11, 1959 INVENTOR OTSCHEIDT WILHEL BY Z Z TORNEY Patented Sept. 16, 19412,255,816 muss anrnsmcsansncmmsr Wilhelm Rotscheidt,Berlln-Charlottenbnrg, Ger

many, assignor to Fides Gesellsehaft fiirdi;

Verwaltung and Verwerhmg yon gewerblichen hrinkter Eaftung Schntsrechtenmit beac ,Ber-

lin, Germarma corporation of Germany 7 Application May 11, 1939 saw No.272,970

c In Germany May 16, 1938 scams. (01. 179-16) The present inventionrelates to a circuit arrangement to reduce the frequency of a givenimpulse train for remote control apparatus, more especially telephoneapparatus.

There are known arrangements for the reduction of the frequency of animpulse train by which, in order to repeat the train with reducedfrequency a marginal relay controlled by the.

charging impulses of a condenser is used.

This arrangement has the disadvantage that a relay of specialconstruction is n, also the condenser used to operate the relay iscomparativelylarge.

By means of the invention it is possible to use an ordinary relay while,at the same time, reducing the magnitude of the condenser. This isattained by the relay, which receives the pulses and repeats them withhalved frequency, being controlled .by the charge and discharge impulsesof a condenser which, during the intervals be tween impulses is chargedwith a definite polarity and voltage and during the current impulses isdischarged by means of reversed'connection to the charging source withdouble this potential diii'erence through the relay windings.

Aselectorofthis yp isfullydisclosedinu'nited States Patent No.1,978,700, granted October 30, 1934, to Fritz Doring, et al.

Fig. 1 shows one example of carrying the invention into eiiect. Fig. 2shows the application of the invention to the control of a motor-driveselector for telephone installations.

The method of operation of the arrangemen shown in Fig. 1 is as follows:

The impulses sent out are accepted by a current pulse relay A (notshown) which corresponds to relay A in Fig. 11 of the before-mentionedpatent to Dorlng et al. Relay A operates at each pulse and releasesduring the intervals between pulses. When the arrangement is at rest thecondenser K is charged over the follow- 'ing circuit: earth, contact a2,condenser K, re-

sistance Wil, battery, earth. The plates of the condenser K have a givenpolarity and potential. When relay A operates, on a received currentpulse, contact of is opened and contacts al and al are closed. Thepolarity of the plates of the condenser is thereby reversed, thecondenser discharges and charges itself but in the opposite sense in thefollowing circuit: earth, contact cl,

condenser K, contacts al, hl, winding I of relay H, battery, earth.Relay H operates. Since the potential difference of the circuit whichcontains the condenser K is double that originally chargholding circuitfor the winding 11 of the relay Hcondenserrisesandwiththesquareofthepotentiai diiference i. e. about fourtimes (A=% C. U).

Therefore, for the operation of relay H, it is sufiicient to provide aproportionately smaller condenser. Relay B after operating breaks itsenergizing circuit at the contact hl, but lock up in the followingcircuit: contact cl (busy relay not shown, corresponding to relay 0 inthe pateat to Doring et al.), contact ht, winding II of the relay,battery, earth.

At contact h! a circuit for energising winding Ii! of the relay H isprepared. The operation of this winding by the condenser K does'not takeplace at this stage, since the condenser -K is already charged throughthe winding I. At the end of the current pulse relay A releases;Condenser K is thereupon discharged andagainchargedintheorl inldirectionover the following circuit: earth, contact a2, condenser K,resistance Wil, battery, earth. When the next current pulse arrives,relay A again operates, condenser K discharges and charges in thereverse direction in the following circuit: earth, contact al, condenserK, contacts al, 712,

winding III of relay H, battery, earth. An opposing field is produced inthe winding 11 of the relay by the discharge and cha ging pulses ofcondenser K which releases the winding IL The is thereby opened atcontact M and at contact h! the differential compound winding isinterrupted and windingIofrelavHisagainplaced in circuit at contact M.When the current impulse ends, relayA again releases and the condenseris newly charged while, on the receipt of the next current impulse, Aoperates again and energises relay H over winding I which is held overits winding 11 independently of the cut- 40 ofl circuit until, at thenext current impulse, the

ing the condenser, the potential energy of the energising windings ofthe motor of the selector.

alternately. Magnets MI and M2 energlse alter-. natelyin a cyclic mannerand the contacts ml and m2 are alternately operated by a cam disc on themotor shaft.- When the winding MI is energised, the coiltact ml isopened and contact m2 closed. Conversely, when M2 is ener- ;gised, m2 isopened. Windings MI and M2 are alternately switched in over contacts mland m2. 'It, should also be noted that the selector is stepped once ateach energisation of the windings Ml or M2. The received pulses aretransmitted to the windings MI and M2 bymeans of the relay H of Fig. l.The selector as shown operates as 'a line selector and isset by twoimmakes a further step. As a consequence contact ml is again opened andcontact m2 closed. The winding M2 conducts current and the selectormakes a further step. This process continues until the 'rest position 11of the second decade is attained. In this position the selector is heldfor a short time since both motor windings are conducting current.Winding M2 is energised in the following circuit: earth, contacts 02,m2,

pulse trains of which the first selects the required decade and thesecond the individual contact in the selected decade. As the selector isof the c-rotary ype. while selecting the decade it moves at a highvelocity over the contacts in the decades until it rests onthe firstcontact of the selected decade. The selector is moved-by the unitsposition selection from the first contact to the desired line by singlesteps.

The control of the motor selector shown in Fig. 2 is enacted by thearrangement of Fig. 1 in the following manner:

Ontl'le seizure of the selector a busy relay 0,

.(not. shown) .is energised and closes its contact cl opening contact02. The holding circuit of relay H is prepared over contact cl- Themotor selector is made ready for the decade selection by the opening ofcontact 02. On receipt of a current impulse the current impulsereceiving relay A energises relay E (Fig. l) and also relay V' (Fig. 2).The circuit for relay V is: earth, contact at, winding of relay V,resistance W12,

test wiper md, rest position II, winding Ml, battery, earth.

On receipt of the third current impulse relay H (Fig. 1) is againenergised. Contact k1 is opened, contact he closed. When contact h'lopens winding Ml is deprived of current, winding contacts h'l, u2,

M2 alone is energised and the selector again commences to rotate. Ittraverses the 10 individual contacts between rest positions 11 and IIIwith great velocity. The selector is held in position III since bothwindings Ml and M2 are conducting current. v The winding M2- isenergised in the following circuit: earth, contacts 122, m2, winding M2,battery, earth. Winding MI is energised in the following circuit: earth,contacts 02, m2, test wiper 1nd, rest position III, contacts 72B, 112,winding Ml, battery, earth. If it is assumed that the tens selection iscompleted afterthree pulses, the current pulse receiving relay newreleases. I

Relay V is shortecircuited at contact at and eventually releases. Theholding circuit of relay H is broken at contact 123. Relay H releases.When relay V releases, a change-over relay U (not shown) is energised inthe same manner as to, andeflects the change-over from the tens to theunits selection. Relay U opens its contact c2 and closes contact ul.

batte y, earth. Relay V holds itself over its con-' tact vi duringthecurrent impulse train during which time it is impulsivelyshort-circuited'by contact us. After' relay V energises, the followingcircuit for theenergising winding Ml of the motor is closed: earth,contacts 122, ml, ener-- gising winding Ml, battery. earth.'

The selector makes a step and moves its control wiper md from theposition II to position I. 3 The selector is stopped at the rest pomtionofis held since both windings Ml andvM2 are conthe first decade at whichthe selector is held since both energising windings Ml and M2 areconducting current. When winding MI is energised contact ml is opened,contact m2 closed andwinding M2 also receives current as follows:

earth, contacts o2, m2, winding M2, battery,

earth. Thefollowing holding circuit'is closed overthe winding Ml earth,contacts 122, m2. test wiper md, rest positionl, contacts n8, n2,

winding Ml, battery, earth.

At the termination of the current impulse,

' relay A releases and relay H (mp1); is held during the subsequentbreak in the following circuit: earth, contacts cl, b3, winding in ofrelay H, contact 123, battery, earth. when the A the. winding MI isinterrupted by opening of.

con'tact=h6. Winding M2 alone is energised and attractsits armature. Theselector makes a further step, opening contact m2 and closing ml. Sincethe, individual contacts betweenthe connected to a source of potential,winding Ml alone. is-energized' after this step. The selector The unitsselection now follows and is assumed 4 to be effective by five currentpulses. on receipt of the first current pulse relays A, H and V operate.Winding M2 islenergised in the following circuit: earth, contacts v2,m2, winding M2, battery, earth. The selector makes one step." By the.energisation of winding M2, contact m2 is opened and contact ml closed.In spite of the opening of contact m2. the selector does not rotateautomatically as in the tens selection but ducting current. Winding Mlis energised in;

the following circuitz earth, contacts 02, ml, winding Ml, battery,earth. Winding M2 is energised in the following circuit: earth, contacts172, ul, hi, winding M2, battery, earth. On the receipt of the nextcurrent pulse relay H releases and breaks the circuit for the winding'M2, the

winding Ml aloneis conducting'current. 1 The selector makes a furtherstep. After this it is held since both magnet windings are againconducting current; winding M2 being. energised in the followingcircuit: earth, contacts 112, m2, winding M2, battery, earth. Winding MIis ener gised in the following circuit: earth, contacts'v2, ul, M,winding Ml, bat ry. earth. On receipt of the third current pulses relayH is again energised and the circuit for winding MI is opened restposition Iland the rest position 11 are not w at contact M. Winding M2alone conducts cur-- rent. The selector makes a further step. 'Afterthis step it is again held until the next current pulse is received. Theselector is rotated in this manner step by step until it reaches thecontact I. Since at this stage the current pulse train-is ended, relaysA, H and V release. At contact v2 the circuit for the energisingwindings Ml and M2 is finally broken and the selector is set, in

the example given. on the contact of the third decade.

At the end of the connection the return of the selector to normal iseffected in a manner which is not of significance to the invention.

I claim:

1. In combination, a condenser, a source of direct current, means forconnecting said condenser to said source to charge the condenser, arelay, and means operated alter the condenser has been charged toconnect the charged condenser and said source in series with said relayto energize the relay, said condenser and said source beingso poled insaid series circuit that the effective total potential impressed by themuponsaidrelayisgreaterthanthepotential of either said condenser or saidsource alone.

2. In combination, a condenser, a source of 7 direct current, a relay,means operatedto connect said condenser periodically to said source tocharge the condenser and, alter each such connection, to connect thesource and said charged condenser in series with said relay, saidcondenser and said source being so poled in said series circuit that theeffective total potential impressed by them upon said relay is greaterthan the potential oi either said' condenser or said source alone, saidrelay having means for causirfi the current irom said source andcondenser in series to operate said relay upon alternate connectionsthereof to the relay, and said last means eiiective after each operationoi said relay to cause the succeeding connection of said source andcondenser in series with the relay to restore said relay to normal.

3. In combination as claimed in claim 2, a switch of the type whosewipers are driven by the cyclic energization of a plurality of motormagnets, and contacts on said relay to control said magnets to move thewipers oi said. switch step by step.

4. In a combination as claimed in claim 2, a switch having a test wiperand an associated bank of contacts, means controlled by said relay formarking one or more predetermined contacts in said bank only when therelay is at normal and for marking one or more other contacts thereinonly when the relay is operated, and means controlled over said testwiper for halting the switch when said wiper engages any of said markedcontacts and, responsive to the, removal of the marking thereirom bysaid relay, operatlng the switch in search for another contact marked bysaid relay.

5. In combination, a condenser, a circuit for charging said condenser inone direction, a

circuit for charging said condenser in the opposite direction, meansoperated by impulses to .connect said condenser alternately to said twocircuits, whereby the connection of said condenser to one of saidcircuits causes thecharge receivedbyitinthe other circuitfirst tobeneutralized and then to be replaced bya charge of the opposite polarity,and a relay in said one circuit responsive to the flow of neutralizingand charging current when said condenser is connected to that circuit. 1

6. In combination, a condenser, a circuit to charging said condenser inone direction, a circuit for charging saidcondenser in 'the oppositedirection, means operated by impulses to connect said condenseralternately to said two circuits, whereby the connection of saidcondenser to each oi said circuits causes the to be neutralized and thento be replaced by a charge of the opposite polarity, a relay having twowindings, means for connecting one 01. said windings in said firstcircuit only when the relay is at normal and iorconnecting the otherwinding therein only when the relay is in operated position, said onewinding effective when connected in said first circuit and energized bythe flow of neutralizing and charging current therein to operate saidrelay, and said other winding eiiectivewhen connected in said firstcircuit'and energized by the fiow of neutralizing and charging currenttherein to restore the relay to normal.

'7. In combination, a condenser, a circuit for charging said condenserin one direction, a circuit for charging said condenser in the oppositedirection, means operated by impulses to connect said condenseralternately to said two circuits, whereby the connection of saidcondenser to one of said circuits causes the charge received by it inthe other circuit first to be neutralized and then to be replaced by acharge of the opposite polarity, a multi-winding relay having one of itswindings connected in said one circuit only when the relay is at normal,said one winding at times being energized by the flow of neutralizingand charging current upon connection of said condenser to said onecircuit and effective to operate said relay, means controlled by therelay upon operating for energizing a second-oi the relay windings tomaintain it in operated position, and a.- differential winding on saidrelay connected in said one circuit only when the relay is in operatedposition and at times energized by the flow of neutralizing and chargingcurrent upon connection of said condenser tosaid ,one circuit to restorelugs to remain in the position to which it was operated by saidmomentary energization until the other of said windings is energized, acondenser, a charging circuit for said condenser, a first dischargecircuit for the condenser including said first winding and a contact ofsaid relay which is closed only when the relay is in said otherposition, asecond discharge circuit for the condenser including saidsecond winding and a contact of said-relay which is closed only when therelay is in said one position, whereby the one of said dischargecircuits effective at any time depends upon the position assumed by therelay at that time, and impulse operated meansfor connecting Saidcondenser alternately to said charging circuit and the effectivedischarge circuit thereby to energize the windings of said relayalternately.

- 9. In combination, a relay adapted to assume eh rge received by it inthe other circuit first by said momentary energization until the other01' said other'windings is energizednz condenser, s first chargingcircuit for said condenser including said first winding and a contact ofsaid relay which is closed only when the relay is in said otherposition, a, second charging circuit in: said condenser including saidsecond winding and a contact of said relay which is closed only when therelay is in said one position, whereby the one of said circuitsefiective at any time alternately.

